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Supplementary equipotential bonding in group 2 medical locations

Former Community Member
Former Community Member
Hi All,

I'm new here and a trainee electrical engineer. 


I am looking for pointers on how to calculate the CSA of equipotential bonding conductors in group 2 medical locations.


Having worked on site, I know that as a standard we use 4/6mm to allow us to stay within the 0.2Ohms resistance but would like to know the theory behind it so I can include this calc in my designs to prove where the result have come from when or if ever questioned.


Thanks,

Sam
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    Plus there's all the usual rules for supplementary bonding conductors as set out in regs 544.2.1 to 544.2.5 - all the stuff about not being smaller than the smaller c.p.c. where interconnecting two exposed-conductive-parts, or half the size of the c.p.c. if interconnecting an exposed-conductive-part to an extraneous-conductive-part and so on, as well as the usual minima of 2.5mm² if mechanically protected or 4mm² otherwise.

      - Andy.
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    Plus there's all the usual rules for supplementary bonding conductors as set out in regs 544.2.1 to 544.2.5 - all the stuff about not being smaller than the smaller c.p.c. where interconnecting two exposed-conductive-parts, or half the size of the c.p.c. if interconnecting an exposed-conductive-part to an extraneous-conductive-part and so on, as well as the usual minima of 2.5mm² if mechanically protected or 4mm² otherwise.

      - Andy.
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